Color me impressed! I hate every tool that needs a pull to start. My shoulder aches just from the thought of dealing with one of these.
Have you ever gotten the cord ripped out of your hand and one of your breasts just got in the way? The whole thing was black and blue for a week! Now, I can chuckle about it but I really considered going to the doctor at the time, it was so painful!
It may not be very green to use lithium batteries, but I've replaced my pull start tiller which I was not using much anyway with a Ryobi hand held tiller. Since I'm converting my entire garden to beds, the big workhorse just would not do anyway. I weed by hand and if I must, do a very light surface tilling, plant and mulch heavy. Electric uses energy a lot more efficiently than anything using gas anyway.
My weed eater is also a Ryobi. My dream, if I knew how, would be to
replace all these motors-that-never-start with sun charged batteries. I know that exists, but I don't understand enough about it and it sounds like it may endanger your lithium, so wait and see and learn for now:
https://werecyclesolar.com/what-kind-of-battery-is-used-for-solar-panels/
My snow blower is a Sun Joe, so battery operated as well. At 73, I'm through with pull cords! They are good for the old fashioned Turkish toilets with The tank above your head and turning the lights on and off above the work bench, maybe the pull blinds. but otherwise, nay nay!
So, again, kudos to you!